#!/usr/bin/env ruby

# -------------------------------------------------------------------------- #
# Copyright 2002-2023, OpenNebula Project, OpenNebula Systems                #
#                                                                            #
# Licensed under the Apache License, Version 2.0 (the "License"); you may    #
# not use this file except in compliance with the License. You may obtain    #
# a copy of the License at                                                   #
#                                                                            #
# http://www.apache.org/licenses/LICENSE-2.0                                 #
#                                                                            #
# Unless required by applicable law or agreed to in writing, software        #
# distributed under the License is distributed on an "AS IS" BASIS,          #
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   #
# See the License for the specific language governing permissions and        #
# limitations under the License.                                             #
#--------------------------------------------------------------------------- #
ONE_LOCATION = ENV['ONE_LOCATION']

if !ONE_LOCATION
    RUBY_LIB_LOCATION = '/usr/lib/one/ruby'
    GEMS_LOCATION     = '/usr/share/one/gems'
    VMDIR             = '/var/lib/one'
    CONFIG_FILE       = '/var/lib/one/config'
    VAR_LOCATION      = '/var/lib/one'
else
    RUBY_LIB_LOCATION = ONE_LOCATION + '/lib/ruby'
    GEMS_LOCATION     = ONE_LOCATION + '/share/gems'
    VMDIR             = ONE_LOCATION + '/var'
    CONFIG_FILE       = ONE_LOCATION + '/var/config'
    VAR_LOCATION      = ONE_LOCATION + '/var'
end

SERVERADMIN_AUTH = VAR_LOCATION + '/.one/onegate_auth'

# %%RUBYGEMS_SETUP_BEGIN%%
if File.directory?(GEMS_LOCATION)
    real_gems_path = File.realpath(GEMS_LOCATION)
    if !defined?(Gem) || Gem.path != [real_gems_path]
        $LOAD_PATH.reject! {|l| l =~ /vendor_ruby/ }

        # Suppress warnings from Rubygems
        # https://github.com/OpenNebula/one/issues/5379
        begin
            verb = $VERBOSE
            $VERBOSE = nil
            require 'rubygems'
            Gem.use_paths(real_gems_path)
        ensure
            $VERBOSE = verb
        end
    end
end
# %%RUBYGEMS_SETUP_END%%

$LOAD_PATH << RUBY_LIB_LOCATION

require 'opennebula'
require 'pathname'
require 'rexml/document'
require 'getoptlong'

require_relative '../../tm/lib/backup'
require_relative '../../tm/lib/tm_action'

opts = GetoptLong.new(
    ['--increment', '-i', GetoptLong::REQUIRED_ARGUMENT]
)

begin
    # --------------------------------------------------------------------------
    # Parse input parameters
    # --------------------------------------------------------------------------
    increment_id = -1

    opts.each do |opt, arg|
        case opt
        when '--increment'
            increment_id = arg.to_i
        end
    end

    action = STDIN.read

    # --------------------------------------------------------------------------
    # Image and Datastore attributes
    # --------------------------------------------------------------------------
    image = TransferManager::BackupImage.new(action)
    chain = if increment_id == -1
                image.chain
            else
                image.chain_up_to(increment_id)
            end

    xml = REXML::Document.new(action).root

    ds_id = xml.elements['DATASTORE/ID'].text.to_i
    bpath = xml.elements['DATASTORE/BASE_PATH'].text
    ruser = xml.elements['DATASTORE/TEMPLATE/RSYNC_USER']&.text || 'oneadmin'
    rhost = xml.elements['DATASTORE/TEMPLATE/RSYNC_HOST'].text

    snap = image.selected || image.last
    burl = "rsync://#{ds_id}/#{image.bj_id}/#{chain}"

    # --------------------------------------------------------------------------
    # Get a list of disk paths stored in the backup
    # --------------------------------------------------------------------------
    script = [<<~EOS]
        set -e -o pipefail; shopt -qs failglob
    EOS

    snap_dir = %(#{bpath}/#{image.vm_id}/#{snap}/)
    snap_dir = Pathname.new(snap_dir).cleanpath.to_s

    script << %(find '#{snap_dir}' -type f -name 'disk.*')

    rc = TransferManager::Action.ssh 'list_files',
                                     :host     => "#{ruser}@#{rhost}",
                                     :forward  => true,
                                     :cmds     => script.join("\n"),
                                     :nostdout => false,
                                     :nostderr => false

    raise StandardError, "Error listing backups: #{rc.stderr}" if rc.code != 0

    disk_paths = rc.stdout.lines.map(&:strip).reject(&:empty?)
rescue StandardError => e
    STDERR.puts e.full_message
    exit(-1)
end

# ------------------------------------------------------------------------------
# Out a json with disk PATHS (for downloader):
# {"0":"rsync://102//0:0e6658/var/lib/one/datastores/102/21/0e6658/disk.0.0"}
# ------------------------------------------------------------------------------
disks = {}

disk_paths.each do |f|
    m = f.match(/disk\.([0-9]+)/)
    next unless m

    disks[m[1]] = "#{burl}#{f}"
end

puts disks.to_json
